What are the functions of the cell envelope?

Answer

Bacteria have a complex multilayered envelope that performs several important functions.

Provides cell stability and stiffness, helping the cell to maintain its shape and structural rigidity
Prevents the cell from bursting or collapsing
Protects the cell from its environment
Regulates the transport of substances in and out of the cell
Forms flagella in some bacteria, which are filamentous extensions that help motility

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